1. (verb) to sell something. Generally the price is low or the goods are dodgy.
2. (verb) to lose a sporting match, usually football, by a huge margin
3. (verb) to masturbate. Sometimes extended to "flog the dog" or "flog the log".
4. (verb) to steal something
5. (verb) to assault somebody
6. (noun) a poser, someone who likes to big-note themselves. Relates back to (3).

1. I flogged my piece of shit car to some uni student.
2. We got flogged by 15 goals today.
3. I caught my little brother having a flog today.
4. Some arsehole's flogged my ciggies!
5. I took this smart-arse out the back of the pub and gave him a flogging.
6. Look at that wanker in the Porsche talking on his car phone. What a flog.